1.
Exploratory Data Analysis
1.3. EDA Techniques 1.3.3. Graphical Techniques: Alphabetic 1.3.3.1. Autocorrelation Plot


Autocorrelation Plot for Sinusoidal Model 
The following is a sample autocorrelation plot of
the LEW.DAT data set.


Conclusions 
We can make the following conclusions from the above plot.


Discussion  The plot exhibits an alternating sequence of positive and negative spikes. These spikes are not decaying to zero. Such a pattern is the autocorrelation plot signature of a sinusoidal model.  
Recommended Next Step  The beam deflection case study gives an example of modeling a sinusoidal model. 